Have you ever rubbed your hands together when they get cold? Why do we do that? We do that for friction. Friction happens when two things that aren’t very smooth rub together to make heat energy. The faster you rub two things together, the more friction ( and heat) you can make. Let’s discover friction!
WHAT YOU’LL NEED
·Soap ·Water·Your hands!
WHAT TO DO
Make sure your hands are dirty.
Rub your hands together until you feel the heat of your hands.
Now, use soap and water to get your hands very slippery(滑的).
Try to make friction happen while your hands are slippery.
Please write down what has happened.
LET’S TALK!
Friction is an energy that happens when two things rub together. When friction happens, it makes heat! When your hands are slippery, they won’t make very much friction and your hands won’t get so hot.
DID YOU KNOW?
Friction happens when you stop your fast running bike.
Ancient people made fire by rubbing two pieces of wood together. Friction happened though they didn’t know it.
____?___
Friction is everywhere. Have you ever noticed situations where friction is happening? If not, ask your parents to take you out in a car. If it is not hot, touch the tires(轮胎) of the car before and after a short drive to see how much warmer they get from friction. This text is most probably________________________.
| A．a science report | B．a car advertisement |
| C．a rubbing introduction | D．a chemistry programme |
What does the word “friction” in this text mean in Chinese?
| A．摩擦 | B．冷却 | C．膨胀 | D．震动 |
___________ is not an example of friction.
| A．Bike riding | B．Car driving | C．Hands rubbing | D．Friction discovering |
What’s the last column(栏目)?
| A．THINK IT OVER! | B．WHAT HAPPENED? |
| C．EVERYDAY ACTION: | D．WORK WITH PARENTS |
阅读下面的短文，根据短文内容完成相关任务。（共5题，每题1分，计5分）
Hi! Welcome to Lotte Mart.(乐天玛特）We have clothes at very good price(价格 ).We have sweaters in all colors at ¥ 16 each. Are they very cheap? And we have black trousers for only ¥9. We have blue bags for sports for just ¥7 for girls. T-shirts in all colours are ¥10 each. The white socks are only¥3. Can you believe it? Come and see in our supermarket.
Please fill in the table according to the advertisement(广告 )for the clothes.
| Clothes |
Color |
Price |
| 56 |
all colors |
¥ 16 |
| trousers |
57 |
¥ 9 |
| bags for sports |
blue |
¥ 58 |
| 59 |
all colors |
¥10 |
| socks |
60 |
¥3 |
This is my school. There are many trees and flowers in it. It’s very beautiful. The teaching building is big and tall. There is a big playground in our school. After 4:30 in the afternoon, many students come to the playground to play football and some students play table tennis in the table tennis room. There are 1,200 students and 25 classes in our school. The students all like to study. The teachers in our school are very good. They help the students to study and the students like them, too. The school looks _____.
| A．small | B．old | C．nice | D．bad |
The school is beautiful because of (因为) ________ in it.
| A．trees and flowers | B．a playground |
| C．students and teachers | D．the table tennis room |
There are at least (至少) _____ students in one class.
| A．50 | B．45 | C．75 | D．65 |
After class the students often go to _____.
| A．their classroom | B．their homes |
| C．the playground | D．the teachers’ office |
Do the students like to study?
| A．Yes,they do. | B．No,they don't. |
| C．Yes,they are. | D．No,they aren't. |
There are many cars over there. Five of them are brown. Twelve of them are red. Three of them are yellow. Four green cars, eight blue cars, two orange cars and one white car are there, too. They are new. They are nice. Look, these aren’t cars, they are buses. They are in different（不同的） colors: ten red, eleven green, seventy yellow and nine blue. They are all old. They are big. All the cars and buses belong to (属于) Mr. Smith.There are __________ cars over there.
| A．thirty | B．thirty-five | C．forty | D．forty-five |
There are __________ buses.
| A．one hundred | B．ninety-nine | C．ninety-eight | D．hundred |
All of the cars over there are in ________ colors.
| A．same | B．the same | C．different | D．the different |
All the cars are _________, but all the buses are _________
| A．new, new | B．old, old | C．old, new | D．new, old |
Whose are all the cars and buses?
| A．Mr. Smith’s | B．Mr. Smith | C．Mr. Smiths’ | D．Mr. Smiths’s |
Hello! My name is David. I’m in Class 3, Grade 7. Here (A) ________ our classroom. Thirty-two desks and thirty-two chairs (B) ________ in it. Some bags are on the desks. Some books are in the bags. (C) 一些录像带在地板上。 Some plants are near the windows. They are fresh. What’s that ? It’s a map of China. Look! What’s this? It’s a baseball. (D) It’s Jeff’s baseball. It’s (E) under the desk.
根据短文内容，完成下列任务。(5分)根据句意填入(A)、B)处所缺的单词。(A)——B)——
把(c)处划线的句子翻译成英语。
把(D)处划线的句子翻译成汉语。
对(E)处划线部分进行提问。
回答问题。
—Where are the 32 desks and the 32 chairs?
—They are ________．
Tim: Mom! Where are my shoes?
Mom: Are they under your bed?
Tim: No, they aren’t.
Mom: Are they behind the door?
Tim: Oh, yes. Here’s one shoe.
Mom: Let me see. Where is the other one?
Tim: Oh, my God! It’s 7:50. It’s time for school! I’m late.
Mom： Don’t worry, dear. Let me help you. Oh, look at the chair!
Tim: It’s under the chair.The dog is playing with it.
根据短文内容，完成下列句子，每空词数不限。(5分)It’s 7:50 in the __ now.
Tim can’t find his__
The other shoe is__
Tim’s __ helps him.
The dog is __ the chair, too.